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    treason

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    treason
    trea‧son /ˈtriːzən/ noun [uncountable]
     Date: 1100-1200
     Language: Old French
     Origin: traison, from Latin traditio 'act of handing over or betraying', from tradere; ⇨ traitor
    the crime of being disloyal to your country or its government, especially by helping its enemies or trying to remove the government using violence ⇨ treachery
        treason against
        Richter is accused of committing treason against the state.
        The defendant was convicted of high treason (=treason of the worst kind) and sentenced to death.
    —treasonable,
    —treasonous adjective:
        a treasonable act against the head of state